I did the test. The result was worse, I had to stop doing the hiit everyday because I was way busy with my work and also because it was raining a lot. So the best thing is to keep doing hiit to improve your capacity to do it for more sprints and get the heartbeat higher, then the herb will work better. I did 15 hours fast and it didn’t get me a good reaction comparing to intense hiit and empty stomach (but not from a long fast, just the sleep fast, if this is a kind of fast).